Phonograph pick-up



March 11, 1.930. c. F. GQUDY 1,750,304

l' PHONOGRAPH PICK-UP Y Filed May 28,' 192s if "51%" 'v Y l 5152-" n liatentecl 11, 1930 vUNITED STATES PATENT OFFICE OABL GoUnY, or FLUsHINNEW YORK, As'sIGNOR 'ro rAoEN'r RADIO coRrORA- TION, or NEW Yomcimy., A CORPORATION OF DELAWARE PHONOGRAPH PICK-UP Application liled :Mayv 28,

This invention relates to electrical pick-.ups used with phonographs, and the general objects of the invention are to provide a pickup unit, which may be used with phonograph 5 tone arms having either a right hand or left hand goose neck, which can be quickly applied to either form of construction, and which will be particularly simple, practical and inexpensive.

These objects are attained by certain novel features of construction, combination and relations of parts, the details of which will appear as the specification proceeds.

Fig. 1 is a plan view partly in section showing the unit as adapted and applied to a tone arm having a right hand bendor goose neck terminal; Fig. 2 is asimilar view showing the device adapted and applied to a tone arm having a left hand bend; Fig. 3 is a left hand side elevation of the device adjusted as in Fig.. 2; Fig. 4. is a rear elevation of the unit in this latter adjustment; Figs. 5 and 6 are detail views of the back o r base portion of the casing and the hood or cover portion of the casing respectively.

As the present invention concerns primarily the mounting of the unit, the particular structure of the unit is not illustrated other 4than to show that' the vibrating Or movable element of the unit at 5 projects from the front of the casing and is provided with a holding socket 6 :for the record engaging needle 7 it being understood that the struc- The projecting portion' of the bushing is shown as having a smoothly shouldered cylindrical part 13 immediately adjacent the ture Of the unit may be similar to that dis? 1928. Serial N0. 281,187.

back wall and an outer screw-threaded part 14.

Engaged with the Smooth cylindrical hub of the bushing, there is shown an annular collarv part'15 on the en d of a supporting arm .in the opposite finger. This clamp structure is of a size to slide freely over the gooseneck or angle turn at the end of the tone arm 21 and to close into gripping engagement with said angle turn when the screw is tightened. The supporting arm may be made of sheet metal,V and is shown as having a strengthening rib 22 embossed in the longitudinal portion of the same and as having the flat Washer terminal 15 embossed in the end of the same.

For securing the arm in adjusted relation, a

lock nut 23 is shown engaged onv the screw portion of the projecting hub, and a clamp washer 24 is indicated interposed between this nut and the hub` encircling portion of the arm.

The arm is of sufficientA length so that the tone arm clam 17 may swing over the top O the casing as the arm is rotated on the hub to carry the clamp from One side of the casing to the other.v In position, at either side of the casing, the supporting arm is secured fast by means of the lock nut 23, it being a simple matter, as will beseen, to shift the arm from one side to the other to adapt the unit for either of the usual styles of phonograph tone arms. The mounting hub 11 is made hollow both forthe sake of lightness and to provide a conduit for the conductor cord of the unit, which is thus brought outl at the backas shown at 25 in Fig. 2, clear of the tone arm and free of other parts.

To enable ready access to the operating parts of the unit,the dome-shaped cover structure is shown as removably supported On the base or back plate by means of an up-turned hook or clip 26 engaging behind the back portion of they. cover as shown particularly in Fig. 3. To enable the cover being slipped down over the back piece, the back wall of the cover is shown as slotted upwardly from the bottom of the same as at 28, said slot being wide enough to pass down over the flange or head 12 of the bushing as shown in Fig. l. The back wall of the cover is further shown as slotted upward `from the lower end of the same at 29 to pass over the shanks of the bolts 30, which fasten the operating parts of the unit to the back plate 8, the cap nuts 3l on the projecting ends of these bolts serving to hold the operating structure to the back wall.

At the front, the cover is shown as bulged outwardly at 32 to accommodate the forward portion of the unit structure, and as slotted at 33 for the projecting shaft portion 5 of the vibrating armature. The structure as described permits the hood to be slipped down over the back S, it passing down over the head of the bushing, the shanks of the mounting screws 30 and the armature shaft 5 in this movement and the clip 26 by engagement inside the back wall of the hood serving to detachably hold itin place in its final position, where in cooperation with the bottom walls 8 and 9, it forms a complete enclosure for the mechanism ofthe unit.

The hood engaging clip is shown formed as an integral finger, cut from the metal of the back, at the upper edge of the opening which is provided in the back to receive the hub of the bushing and the flange of the bushing is shown in Fig. 5 as flattened at one edge at 34.- to pass the root portion of this linger where it joins with the back plate. In this way, the flattened portion of the bushing flange braces the clip and the clip assists in holding the bushing in place and preventing the bushing from turning in the back plate, .the clip in effect acting as a key for the bushing.

The back wall of the hood is shown as notched or cut back as at 35 in Fig. 6 to receive and fit over the side edges of the bottom extension 9 as the hood is slid down into position over the back. This engagement of the hoodover the bottom extension centers the hood at the bottom of the unit and the clip and flange of the bushing center the hood at the top so the hood is positively secured and positioned both at top and bottom. The clamp portion of the tone arm engaging mem'- ber extends forwardly into the plane of the unit as will be clear from Figs. l, 2 and 3, making the device exceedingly compact and neat in appearance. The back and hood of the casing and the supporting arm as well,

' may all be made of sheet metal and hence be light and inexpensive.

lVhat is claimed is:

1. A casing for an electric phonograph pick-up, comprising av back wall having a forwardly projecting bottom wall extension,

a cover hood engageable over the back wall and having an open lower end adapted to be closed by the bottom extension when in place on the back wall, a hub projecting from the back wall and by which the casing with the pick-up mechanism therein may be mounted in proper relation on a phonograph and a tone arm vclamp shiftably engaged on the projecting hub, said clamp comprising an arm portion swivelled on the hub and having at its free end aorwardly projecting tone arm clamping structure standing in the plane of the cover and adapted to swing over the top of the cover from one side to the other.

2. An electric phonograph pick-up unit having a tubular screw-threaded hub projecting from the rear of the same, an arm swivelled on the hub, a nut on the screw-threaded portion of the hub for securing the arm on the hub in different angular positions of the same and a tone arm clamp carried by the free end of said angularly adjustable arm.

3. In electric phonograph pick-up units, a back wall having a .forwardly projecting bottom extension, a hood overlying the back wall, said hood having an open lower end adapted to be closed by the bottom wall eX- tension of the back wall, means for securing said hood to the back wall in position with said extension forming a closure to the lower end of the hood, said securing means including a clip on the back wall engaging inside the hood, said hood being notched to fit down over the edges of the bottom extension and whereby'the hood is positioned at dilerent points and held to the back wall.

4. A casing for electric phonograph pickup units, comprising a back wall having an opening formed therein and a portion of the removed material at said opening bent reversely to form a clip at one face of said wall, and a hood engageable over said back wall and slotted to receive said clip.

5. A casing for electric phonograph pickup units, comprising a back wall havino an opening formed therein and a portion of the removed material at said opening bent reversely to form a clip at one face of said wall, a hood engageable over said back wall and slotted to receive said clip, a brushing engaged in the opening in the'back wall having a flange recessed at one side to engage and brace the root portion of the clip.

6. A casing for electric phonograph pickup units, comprising a back wall having an opening formed therein and a portion of the removed material at said opening bent reversely to form a clip at one face of said wall, a hood engageable over said back wall and slotted to receive said clip, a bushing engaged in the opening in the back wall having a liange recessed at one side to engage and brace the root portion of the clip, the slot in the hood being wide enough to fit over said flange on the bushing. l

7. A casing for electric phonograph pickj t arm swivelled `on the back 0 up units, comprising a back wall ha an openin formed therein and a portion o the remove material at said opening bent reversely to form a clip at one face of said wall, a hood engageable over said back wall and slotted to receive said clip,'a bushing engaged in the opening in the back wall having a ange recessed at one side :to engage an brace the rootjportion of the clip, the slot in the hood bein 'wide enough to fit over said unit from one side to the opposite side as the arm is swivelled about'the connection with the side of the pickup unit. of 9. In electric phonograph'pickup units, a

a back wall and a back of the .unit and means for rigidlysecuring said swivelled arm positioned withy the tone arm clamping structure at the desired sheet metal .casing havin cooperating hood secure thereto to form a support and enclosure for the mechanism of the pickup and a tubular bushing having a flanged end at the inner face of said-sheet metal back wall, said bushin extending through the back wall and pro]ecting'rear wardly therefrom, said rearwardly projectingportion of said hollow bushing being externally screw-threaded for the attachment of supporting fastenings.

10. An electric pickup unit, having a projecting operating part at the forward portion of the same and a` casing enclosing the mechanism of the unit, said casing having a back wall with a rearwardly projecting support by which the pickup unit is su ported in operative relation and having a i) modating the projecting operating part of the unit mechanism.

CARL F. GOUDY.

ront Wall with a i forwardly bu-lged out portion freely accom-- 

